diff -Nur path.c path.c
--- path.c	2011-09-25 18:53:42.000000000 +0200
+++ path.c	2018-03-04 08:13:24.836905800 +0200
@@ -317,8 +317,8 @@
 #if __CYGWIN__
    /* Use cygwin function to convert a DOS path to a POSIX path. */
    if( *path && path[1] == ':' && isalpha(*path) ) {
-      int err = cygwin_conv_to_posix_path(path, cpath);
-      if (err)
+      int err = cygwin_conv_path(CCP_WIN_A_TO_POSIX, path, cpath, PATH_MAX);
+      if (err < 0)
 	 Fatal( "error converting \"%s\" - %s\n",
 		path, strerror (errno));
       if( path[2] != '/' && path[2] != '\\' )
diff -Nur sysintf.c sysintf.c
--- sysintf.c	2011-09-25 18:53:42.000000000 +0200
+++ sysintf.c	2018-03-04 08:15:54.315421400 +0200
@@ -69,7 +69,7 @@
 #   include <sys/timeb.h>
 #endif
 
-/* for cygwin_conv_to_posix_path() in Prolog() and for cygdospath()*/
+/* for cygwin_conv_path() in Prolog() and for cygdospath()*/
 #if __CYGWIN__
 #   include <sys/cygwin.h>
 #endif
@@ -538,8 +538,8 @@
    if ( (CygDrvPre = MALLOC( PATH_MAX, char)) == NIL(char) )
       No_ram();
    else {
-      int err = cygwin_conv_to_posix_path("c:", CygDrvPre);
-      if (err)
+      int err = cygwin_conv_path(CCP_WIN_A_TO_POSIX, "c:", CygDrvPre, PATH_MAX);
+      if (err < 0)
 	 Fatal( "error converting \"%s\" - %s\n",
 		CygDrvPre, strerror (errno));
       if( (CygDrvPreLen = strlen(CygDrvPre)) == 2 ) {
@@ -1144,8 +1144,8 @@
 
    if( *src && src[0] == '/' ) {
       char *tmp;
-      int err = cygwin_conv_to_win32_path(src, buf);
-      if (err)
+      int err = cygwin_conv_path(CCP_POSIX_TO_WIN_A, src, buf, PATH_MAX);
+      if (err < 0)
 	 Fatal( "error converting \"%s\" - %s\n",
 		src, strerror (errno));